One study published in the Journal of the American Medical Association found that more than half of teenagers who vape use Juul's products, with mint being the most popular flavor among high schoolers. Researchers found that 27.5% of high school students and 10.5% of eighth graders say they use e-cigarettes with more than half of those using Juul. Of those, 72% choose mint as their favorite flavor. Mango, which was removed from retailers, came in second, with 59% of eighth grade students reporting that as their favorite flavor.

"These results are unacceptable," K.C. Crosthwaite, CEO of Juul Labs, said in a statement. "That is why we must reset the vapor category in the U.S. and earn the trust of society by working cooperatively with regulators, Attorneys General, public health officials, and other stakeholders to combat underage use."

Crosthwaite said the company would support the anticipated federal "flavor policy."

According to CNBC, the mint flavor accounts for up to 70% of Juul's sales in the U.S. according to a person familiar with the company's finances. The rest of the company's flavors and products were removed from retailer's shelves earlier this year amid pressure from the Food and Drug Administration. Juul will only sell three flavors in the U.S., including menthol, Virginia tobacco and classic tobacco.

"We intend to clear the market of flavored e-cigarettes to reverse the deeply concerning epidemic of youth e-cigarette use that is impacting children, families, schools and communities," Health and Human Services Secretary Alex Azar wrote in a statement in September.